Testing slide fastener



instantaneous force applied, but means for this purpose forms no part of the present invention.

The spring balance 22 may be secured in a fixed position in any suitable manner, as by transversely extending pins 39 and 4| affixed to opposite ends of the frame of the spring balance and mounted on fixed supports 42 and 43, respectively. Any suitable connection, such as a small cable 44 may be provided between slider H and pull rin 49 of the spring balance. Preferably, cable 44 is trained over a. guide roller 45 so as to ive a straight line motion to the pull ring 46 of. the spring balance. For moving the car along the track away from the spring balance, any suitable tension element, preferably a small cable 41 may be connected to draft member 36 and extend about a guide roller 48 to a take-up mechanism, such as a winding drum 49.

2. Apparatus for testing slide fasteners comprising a frame for securing webs joined by a slide fastener, force indicating means adapted for connection to the slider of the slide fastener, 21 car for carrying the frame away from the force indicating means, a track for guiding the car in a directionsubstantially parallel to the direction in which the length of the fastener is disposed, and a pivotal connection between the car and the frame for supporting the latter for turning substantially from end to end on the car.

3. Apparatus for testing slide fasteners comprising a, frame for securing webs joined by a slide fastener, force indicating means adapted for connection to the slider of the slide fastener, a car for carrying the frame away from the force in- *dicating means, a track for guiding the car in a In practicing the invention with the illustrated apparatus, the webs carrying the slide fastener to be tested, such as webs l3 and [4, may be interposed between mating sections l1 and H! of the frame l6 and preferably impaled on stud bolts l9 after which these sections of the frame may be clamped together by tightening nuts on bolts l9. This frame may then be secured to bed plate 21 by passing stud bolts 28 thereof through registering holes in the frame and tightening wing nuts 29 on these stud bolts. The bed plate is then adjusted about its pivotal axis comprising pivot bolt 3i until latch 33 may be swung about its pivot into one of the complementary notches 34 or 34' so that the plate is thereby locked against rotation relative to the car. The slider II is connected to pull ring 46 of the spring balance with the slider arranged adjacent the end of the car remote from the spring balance. The tension element, such as cable 41, may be connected to draft member 36 and to a suitable take-up mechanism such as winding drum 49. The car may be pulled along the track away from the spring balance by this tension element, as by winding the element on drum 49 so as to effect relative movement between slider II and fastening elements 12 length wise of the slide fastener. The amount of force required to effect this movement will then be indicated instantaneously by the position of the pointer 38 relative to-scale 31.

It will be seen that when the slider has traversed the fastener for one length thereof, the same operation may be repeated any number of times merely by returning the car to its initial position and then causing the car to travel away from the spring balance as just described. It will also be seen that in order to have the slide fastener tested by effecting relative movement between the slider and the fastening elements in opposite directions, this may be accomplished by releasing latch 33 from the notch in which it is direction substantially parallel to the direction in which the length of the fastener is disposed, and releasable means for holding the frame from turning relative to the car.

4. Apparatus for testing slide fasteners comprising a frame for securing webs joined by a slide fastener, force indicating means adapted for connection to the slider of the slide fastener, a car for carrying the frame away from the force indicating means, a track for guiding the car in a direction substantially parallel to the direction .for'engaging or disengaging the fastening elements, comprising means for holding said fastening elements, force indicating means adapted for connection to said slider, and means for moving 'said. holding means to produce relative movement between said fastening elements and said slider, said holding means having a pivotal mounting whereby said holding means may be swung end for end so that relative movement between said fastening elements and said slider may be such as to either engage or disengage said fastening elements.

6. Apparatus for testing a slide fastener having ,interengageable fastening elements and a.

I slider for engaging or disengaging the fastening engaged, turning the bed plate end for end so that latch 33 may be engaged in the notch in the other end of the bed plate, and then causing the car again to travel away from the spring balance in the same manner as previously set forth herein.

What I claim is:

1. Apparatus for testing slide fasteners comprising a frame for securing webs joined by a slide fastener, force indicating means adapted for connection to the slider of the slide fastener, a platform adapted to travel away from the force indicating means, and a pivotal connection between the platform and the frame for supporting the latter for turning substantially from end to end on the platform.

elements, comprising means for holding said fastening elements, means for imparting relative movement between said fastening elements and said slider to open said slide fastener, means for indicating the force required to open said slide fastener, and means for pivotably mounting said holding means whereby end for end adjusting movement of said holding means will enable said second-mentioned means to close said slide fastener and said indicating means will determine the force required to close said slide fastener. CHARLES F. SCHWARZ.

REFERENCES CiTED The following references are of record in the file-of this patent:

UNITED STATES PATENTS Number 

